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STEAM ENGINE. 7 N0. 400,847. PatentedApr. Z, 1889.

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(No Model.) 3 Shets Sheet 2. I G. 0.. HEGGEM.

STEAM ENGlNB Patented Apr. 2, 1889.

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' STEAM EN Patentd'Apr. 2, 1889'.

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UNITED STATES PATENT OFFICE.

CHARLES O. HEGGEM, OF MASSILLON, OHIO, ASSIGNOR TO RUSSELL & COM- PANY, OF SAME PLACE.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 400,847, dated April 2, 1889.v

Application filed July M, 1888. Serial No. 280,912. (No model.)

To all whom, it may concern.-

Be it known that 1, CHARLES O. I-IEGGEM, a citizen of the United States, and a resident of Massillon, county of Stark, State of Ohio, have invented a new and useful 'Im provement in Steam-l lngines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification.

LIyIIH'OIIiIOIl relates to an improvement in engines.

The object is to provide an improved construction and arrangement of valves and valve-operating mechanism, whereby the friction may be reduced to a minimum and ready access may be had thereto for taking up wear, cleaning, and inspecting.

With these ends in view my invention consists in certain features of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view of the engine in side elevation. Fig. 2 is a plan view, partly in section. Fig. 3 is a partial vertical section through the exhaust. Fig. :i: is an enlarged partial perspective view showing the intermediate valve-controlling mechanism. Fig. 5is an enlarged vertical section taken through line H of Fig. 4. Fig. 6

is an enlarged vertical section taken through line y 3 of Fig. at. Fig. 7 is a detail view of one of the valves and cut-off valves in horizontal section.

A represents the bed-frame of the engine, having the steam-chest B and cylinder C suitably supported thereon at one end, and the main shaft D suitably journaled therein at the opposite end.

The steam-inlet pipe is denoted by b, and is provided with a valve,b, as is usual. The exhaust-pipe is denoted by c.

E represents the slide-valve to admit steam to the cylinder. It is made hollow and its face toward the steam-chest is of gridiron construction, a series of bars, 6, alternating with a series of openings, 6. The valve E is also cut away on its under side between its edges, as shown at 6 which admits of steampressure under the greater portion of the bottom. On the back of the valve E the cut-off valve F is mounted. It is also of the gridiron style, its cross-bars f and openings f corresponding to the bars 6 and openings 6 in the slide-valve E. In order, however, to secure a steam-cushion between the adjacent faces of the valves E and F, the faces of the bars f on the sides toward the valve E'are hollowed out, as shown at f, so that the two valves E and F each operate between two strata of steam, which for the short duration of each stroke is of substantial uniform pressure, and hence the valves are essentially balanced and the friction is reduced to a minimum.

The exhaust is effected by means of a pair of rocking valves, G, supported in cylindrical seats II, extending transversely beneath the cylinder and intercepting the exhaust-conduit h, leading from the ends of the cylinder to the exhaust-pipe c. The rods or shafts which rock the valves G are provided with crank-arms the free ends of which are connected, by means of rods g, with a vibrating arm or plate, a, mounted between the crankarms g.

Intermediate of the main shaft D and the steam chest and cylinder the bed-frame is provided with a box-like portion, a, having an open top, in which [its a cover, a. The cover a is provided cent ally and transversely to the engine with a downwardly-projected web or lug, a gradually narrowing as itextends downwardly, presenting oblique faces a 011 its opposite sides. The upper edges of the box portion a are provided with a shoulder, (0, on theirinner faces, and the cover a is adapted to fit within the sides of the box portion and seat on the shoulder or. The cover is held firmly in position by throughbolts K, extending through the cover and its web or lug a and through the bottom of the box portion a, and by bolts K near the opposite sides of the said box portion. Two sets of half-bearings, L, are seated in the box portion (i -one set on each side of the web orlug aF-and in said bearings are journaled a set of rock-shafts, M and N-one in each set. The half-bearings are formed scant, in order to admit of taking up wear, and between the half-bearings toward the web a and the web 100 there are inserted wedge-blocks 0 through the finely-threaded perforations o, in which extend the t inelythreaded bolts I, which serve to draw up on the wedges O, and crowd the half-bearings Ii together when turned in one direct ion, and to .lowcr the wedges andlooscn the bearings when turned in the opposite direetion. Each rock-shaft M and N is provided with apair of n pwardl y-exten ding arms, m m and n n, respectively, which enter through elongated slots 7' in the cover a, and permit the arms to swing a limited distance back and forth lengthwise of the engine. The arms n1 m and n n are arranged alternately with respect to their distances from the 1011- gitudinal arms of the engine, and are con neeted with the eccentrics and with the valves, as follows: The arm n2 is connected with the slide-valve I by the connecting-rod e. The arm m is connected with the eccentric Q on the main shaft 1) by the rod g, and the rockshaft M, which projects through the outer end of the box portion (1, provided with a crank, the free end of which is connected with the vibrating plate f, which operates the exhaust-valves by a rod, o The arm a is connected with the sliding cut-off valve'F by a rod, ,whieh has a bearing in each end of the steam-chest, as shown, and the arm n is connected with an eccentric, Q, 011 the main shaft. The valveo iierating mechanism is thus located where it is readily accessible, the movements of the several parts are very slight and entirely free from any jerky motion, and the wear may be taken up with the greatest facility.

The rocking of the shaft M admits steam and opens and closes the exhaust-ports,while the rocking of the shaft l\' cuts off the steam at the proper moment.

The piston-rod R and the cranlerod II are connected to the cross-head S in any welllcnown or desired manner.

Having thus fully described my invention, what: I claim as new, and desire to secure by Letters l atent, is

1. In a steam-engine, the combination of a slide-valve for steam admission and a cut off valve seated on the slide-valve and provided with a hollowedout face in normal connnunication with the interior of the steam-chest to retain steam between the valves, sul'istantially as described, and for the purpose set forth.

In a stean'i-engine, the combination of a slide-valve for steam admission, having its inner face cut under to admit steam from the steam-chest, and a cut-off valve seated on the slid e-valve, substantially as described, and for the purpose set forth.

In a SlUtldll-Ollglllt), the combiim-tion of a slide-valve for steam admission, having its inner face out under to admit steam, and a cut-off valve seated on the slide-valve and having its face hollowed out to retain steam between the valves, substan tial l y as descri i )ed, and for the purpose set forth.

4-. In a stean'l-cngine, the combination,arit li a slide-valve of the gridiron form, of a cutoff of the gridiron form seated on the slidevalve and having the faces of its bars hollowed out and in normal communieation with the interior of the steam-chest to receive-and retain steam for the pnrpose of balancing the valves, substantially as described, and for the purpose set forth.

5. In a stean'i-el'lgine, the Combination, with the steam-admission and steanrcut-off valves, of a pair of rocking exhaust-valves, operating-arms secured to their shafts, a vibrating plate or arm connected with their operatingarms, and means for vibrating the plate or arm, substantially as described, and for the purpose set forth.

(3. In a steam-engine, the combination,with the main shaft and the steam wont/rolling valves, of a box-like pm-tion ot' the supporting-frame intermediate of the main shaft and cylinder, movable bearings seated in said boxlike'portion, a pair of rock-shafts jourualed.

in the movable bearings, a pair of wedges in engagement with the bearings, and means for operating the wedges to take up wear, substantially as described, and for the purpose set forth.

7. In a steam-engine, the combination,with the main shaft and valves for controllin the admission of steam, of abox-like supportingframe intermediate of the main shaft and valves, a cover to the said box-like portion, the cover provided with a depending central web having inclined sides, movable hearings on opposite sides of the web, rock-shafts journaled in the bearings, arms secured to the rock-shaft and extending upward through openings :in the cover, inclined face blocks inserted between the web and bearings, and means for operating the inclined face blocks, substantially as described, and for the purpose set forth.

8. In combination, the main shaft, the three steam controlling valves, the intermediate roek-shati'ts provided with arms-one with three arms and the other with two--eonnections between the main shaft and one arm of each shaft, and connections between the other arms and the valves, substantially as described, and for the purpose set forth.

In testimony whereof I have hereunto set my hand this 19th day of July, A. I). 1888.

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